3. IIC从机

IIC从机

  • W

    能否提供一个IIC作为从机的代码

    0
  • 华

    void iic_init(enum iic_channel_t channel, uint16_t speed, uint16_t slave_addr)
    {
    volatile struct iic_reg_t *iic_reg;

    if(channel == IIC_CHANNEL_0)
{
    iic_reg = IIC0_REG_BASE;
}
else
{
    iic_reg = IIC1_REG_BASE;
}

iic_reg->clkdiv.clk_div = (system_get_pclk_config()*1000/speed-10)/2;
iic_reg->control.soft_reset = 1;
iic_reg->control.seven_bit = 1;
iic_reg->address.slv_addr = slave_addr;

iic_byte_period[channel] = 1000/speed + 1;
//enable interrupt
iic_reg->control.rec_noemp_ie = 1;//接收fifo非空中断
iic_reg->control.slv_noful_ie = 1;//从机发送fifo不满中断
NVIC_EnableIRQ(IIC0_IRQn);

    }

    void iic0_isr(void)
    {
    volatile struct iic_reg_t *iic_reg = IIC0_REG_BASE;
    uint8_t data;

    if(iic_reg->status.rec_emp == 0)//接收fifo非空
{
    iic_test_reg_addr = iic_reg->data;//从机接收数据
	co_printf("%d rec_data =  %d   \r\n",iic_master_data_rx_cnt++,iic_test_reg_addr);
}
else if(iic_reg->status.slv_trans_ful ==0){//从机发送fifo不满
	while(iic_reg->status.slv_trans_ful ==0){
		data = rand() & 0xFF;//从机发送随机数据
		iic_reg->slavedata.slave_data = data;//iic_slave_data_Tx_buffer[iic_slave_data_Tx_cnt++];
		 co_printf("send %d.\r\n", data);

	}
}

    }

    0